Also, another power creep power that could be awesome would be the ability to DISRUPT_REPAIR (possibly as an AOE) to prevent any structure from being repaired. This would be a great counter to the wall/rampart strat of ignore the attackers and just dump more energy into it.

I'm not experienced with this at all but I think it's difficult to keep repairing ramparts/walls with a disrupted terminal.

I think it's a bug. (It's been there for at least a year...) The PTR doc says that every controller upgrade takes 1000 control points. Actually it is the same amount as on the main server. You're right about it being visual as it shows there were only those 1000 points needed.